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Are there any published flow rates for stock 340 heads of the various castings and valve sizes??? Next would be.... how about mildly worked, ie first half inch into the ports, not really messing with bowls yet....? Cheers! Steve

OK, how dare I forget "port matching"! This was a Ford Racing (Edelbrock) head that I matched to a RPM intake for a 331 build. Quite the mismatch going INTO the head! Pulled over 300HP at the rear wheels at a modest 4000ish rpms, a very well mannered street engine. Hoping to do similar for...

OK, first, I missed the second page of replies! Quite the pictures of castings close up!!! So if any of my comments are "outdated" my bad. I can see that there are definitely "some" impediments to flow, that need to go! S Looks like a set of "you finish" heads..... With no valves...

Slanted Mark4, LOTS of good info here to believe. Some cautionary, and some to watch out for! If you don't want to mess with the negative cable when storing, get one of the pictured quick disconnects! The posters that recommend this on the NEGATIVE cable are more correct!!! Just...

Mattax, GREAT response with the illustrated bits! Thank-you! That is one sneaky place to put a ballast resistor! I'll see if I can follow that single wire back to....??? Could it be a tach feed wire? ...more to come! Steve

PS: Are J and X heads both the same combustion chamber size if the valves are indeed different here? How much smaller are the "small" valves....? Good shop manual or such recommendations for these engines?

Alrighty then! First couple of pic's are: "I don't have much of a clue things in the engine compartment!" Rest are just general purpose what I've been left with. So what is this first thing adjacent to the M/C here on the firewall? With the connector towards the bottom of it facing into...

OK, take 2.....website difficulties! Had time to snap a few pics of the engine and bits. Guessing these are the "J" markings although they look like big "U"s..... Sooooo, actual valve size remains TBD! Appears to be original carb, but not sure where numbers are and not worried at the...

Mattax, Wow! Great bits to know about dist! Hopefully I can get some time later today or tomorrow to verify some physical stuff first, before actually firing things up! .....just noticed air is missing from one of the tires..... damned cats probably stole it...... Cheers! Steve

HSorman, All good stuff!!!! Basic target numbers are good to know! Since I am "olds cool" by being, I'll fire up my stand alone tach and my timing gun and see what I've got.... Plot out a crude curve up to 3K and see where we're at! Adjust as neeeded! Any advice on creating better spark with...

Guys, ALL great responses, just what I was looking for....little bits of goodness. The head info was new to me, I can check for casting numbers to confirm, but suspect that the 71 should have the bigger valves....BUTT, confirm confirm confirm! Lifters: yah that is a crazy subject!!! I guess...

RRR, Good to know! Will see if I can't dig up the specs on it for reference. Thanks! Steve

abdywgn, Greetings! I have yet to discern all the detail of this Demon. It is a 71 model, plain as Jane 4spd car! Bench seat to boot! It appears to have been rebuilt back in the early to mid 70's when the prev owner bought the car to drive in high school......and it hasn't been touched...

Greetings! New to the Pentastar world and the rest of the world has kept me from getting anything done on my 71-72 340 Demon that I acquired a couple of years back. Clutch is still bad and my shop is packed with OPS (Other People's Stuff) at the moment, plus a failed lift install! (too thin...

Should be sold today! Spoken for..... Hope to complete deal today. Thanks for looking/replying all!

SGBarracuda, Wow! Didn't think they were that small.....!!! I knew that they were smaller than the "big" pattern....just didn't believe that much! Thanks! Steve

Set of four used 70's small bolt pattern (5x4") Rally Rallye rims 14" x 5.5". Three were repainted gold. One is original silver. Various markings: "14 x 5-1/2" 19,26,21 K,G JJ C,B,D 882 and one I can't find markings on.... Items separated by commas are what is seen on different rims...

OK, what color were the Rallye wheels available in? 1972 Demon.... I appear to have a set of silver (stock color) and a set of gold wheels, likely repainted, but just checking! Will be turning one of the sets loose soon as soon as I figure which ones to hang on to.... Thanks!!! Steve

Oldmanmopar, Thanks for the info and pic's! Not sure I'll be doing a motor swap just yet, but dropping everything out the bottom sure looks like a sweet way go go..... Dano- That 3/8" per side is fairly significant! I'm either going to run the later 5 slot Mopar wheels or the BBP...

halfafish, OK! Did not see the upper arm replacement coming! SO, entire spindle, upper arm, and "everything" else swap! That's doable. Rear axle...hmmmm, gonna hafta go for the picture. I know it's a sure trac with about a 3.55 in it IIRC. But that doesn't give you the housing type. Fords...

One more thing this guy did, I believe that he installed the "improved" K-member at some point.....which means I can go 383/426/440 power at any point with no cutting and hacking!!!??? Love all the "best bikini" and bigger cup bikini ads! Do they change to snow wear in the winter??? :)))) Steve

crackedback, Thanks for that tag comment! Makes sense!!! Just wasn't sure "where normal is"...... Had a 70 Cougar for a while with four pages of build sheets! Loaded car, was actually a marketing car for an exec or such.....first two sheets listed all options and had a line for "sent out...

Newbie here, pardon the question repeat if so....search failed me. Have been doing this sort of thing on Fords for years, but this is my first Mopar, hoping for something easy.... I would like to change over to the 5 on 4.5" wheel pattern on a 71 Demon. (Saw it on a local 72 Duster and...

Greetings! LOTS going on here, so I'll try and keep it simple...... Picked up a 71 Demon 340 via a deceased friend....his old college car.... has very rare "9 horn" option, which I cannot find on the fender tag. BUTT, I did finally find the fender tag today! Thought it was MIA.....nope, just...